Spoilers: Argwylon, the pact on Orion's page, and The Vaults of Winter's forest king.
Argwylon
Durthu comes in Realm of the Wood Elves with Orion. He leads Argwylon. The play page calls him an elder whose alliance with the elves has been worn by damage to the forest. He is a large fighter and a caster. Tree Kin hold the front. Glade Guard shoot from outside the press. The Deeproots can move him between magical forests, and the forest he leaves still needs a guard.
Drycha is the free lord on the same pack, and she restricts Elven troops. The Sisters of Twilight are a different purchase, The Twisted and the Twilight. Orion, Durthu, and Drycha remain the three Realm of the Wood Elves lords. A healed forest is still the race's work, whoever is leading the army that walks the roots.
The spirit side of the pact
Orion's lore places Durthu on the spirit side of the pact. He is an ancient Treeman who helped bind the forest spirits to the elves. The shared defence of Athel Loren brings Elven warriors and woodland spirits into the same armies, even when their leaders distrust one another. That is the relationship this campaign inherits.
Drycha makes that distrust a recruitment rule. Her Glamoured Elves are weaker and Expendable, and her quest frees Coeddil as a Legendary Hero. Durthu's Argwylon army can still mix the Elven line with the spirits. The distrust is background. The roster on his campaign is the player's mix.
The novel that follows the king
The Vaults of Winter, by Darius Hinks, follows Orion. He slumbers in winter and is reborn in spring. This year a curse sits in that renewal. He leads the asrai to war. A traitor inside the realm stays unnamed on the jacket. The Warhammer Chronicles collection adds Tears of Isha and The Council of Beasts beside that first novel.
Durthu's campaign is the elder at the head of Argwylon. A Ritual of Rebirth restores a forest the player chooses. That ritual is the campaign. The unmasking in the novel belongs to the forest king.
Durthu: gameplay and availability · More character stories
Sources
- SEGA Immortal Empires DLC Ownership Guide — support.sega.com
- Orion: The Vaults of Winter — blacklibrary.com
- Warhammer Chronicles: The Orion Trilogy — blacklibrary.com
- Realm of the Wood Elves — store.steampowered.com